¿Cómo puedo realizar envió masivo de correos?

[pgr]

No hay limite de 250, se pueden enviar millares sin problema.

Aqui se explica algo:

Limit to emails sent in a Campaign?

Short answer: There is no limit: you can send as many emails you wish with an email Campaign Long answer: There is no limit, however: each time the email Campaigns scheduler in charge of sending emails is run, it will process a batch of emails. . the number of emails per batch is defined in a SuiteCRM variable that can be manipulated going to Admin->Emails section->Campaign emails and change the value of “Number of emails sent per batch” then save. (you may define it by user or for the who…

y tiene ahi tambien un enlace para alguna documentación de SugarCRM que explica algo más.